Validity of body adiposity index in predicting body fat in a sample of brazilian women

Abstract

Objective: This study aimed to verify the validity of BAI in predicting %BF in a sample of Brazilian women Design and Methods: A total of 102 women (average age 60.3 6 9.8) were assessed. To determine percentage body fat (% BF), dual-energy X-ray absorptiometry (DXA) was used as the "gold standard." To evaluate the association between body adiposity index (BAI) and % BF assessed by DXA, we used Pearson's correlation coefficient. Paired sample t-test was used to test differences in mean % BF between BAI and DXA. To evaluate the concordance between % BF measured by DXA and estimated by BAI, we used the Lin's concordance correlation coefficient and the agreement analysis of Bland-Altman. Results: The correlation between % BF obtained by DXA and that estimated by BAI was r 5 0.65, P < 0.001. Paired t-test showed significant mean difference between methods (P < 0.0001). Lin's concordance correlation coefficient was C_b 5 0.73, which is classified as poor, while the Bland-Altman plots showed BAI underestimating % BF in relation to the used criterion measure in a large portion of the sample. Conclusions: Results of the present study show that BAI presented low agreement with % BF measured by DXA, which is not recommended for % BF prediction in this studied sample.

Estimation of Female Body Fat Percentage Based on Body Circumferences

“…In the present study, however, BMI (r = 0.610) was better correlated with BF% than BAI (r = 0.529). Cerqueira et al 9 found similar results, in a study conducted in the state of Minas Gerais, in southeastern Brazil. In a sample of 104 adult and elder women, the BF% estimated by BAI was positively correlated with BF% with DXA (r = 0.605), but these were significantly different, with paired t-test (t = -7.07).…”

“…This, however, may not be accurate in several populations. 9,10 Several authors proposed new alternatives with simple variables, but each one is based on a specific population. Few equations exist concerning south Brazilian population, especially if it refers to young women individuals.…”

Comparação e Concordância da gordura corporal em crianças através de três métodos duplamente indiretos

“…Essas diferenças são reportadas na literatura, que afirmam que apesar dos protocolos se correlacionarem, os valores podem ser discrepantes (1,4,15,18), o que mostra a importância de se escolher o melhor método adequado para estimar a gordura corporal.…”

“…A obesidade é uma doença que vem se constituindo em um dos grandes problemas da saúde mundial, afetando um número cada vez maior de crianças, sem importar o gênero, o nível socioeconômico e a etnia (1). No Brasil, bem como em outros países em desenvolvimento, o sobrepeso e a obesidade são as alterações nutricionais mais relevantes encontradas nessa faixa etária (2).…”

“…No Brasil, bem como em outros países em desenvolvimento, o sobrepeso e a obesidade são as alterações nutricionais mais relevantes encontradas nessa faixa etária (2). Assim, desenvolver e verificar os métodos de avaliação da composição corporal vem se tornando cada vez mais essenciais para o diagnóstico precoce dessa epidemia mundial (1,2).…”